feeling worse after b12 injections Common & Rare Side Effects of Vitamin Why Do I Feel Worse

Circulating insulin-like growth factor I mediates the protective effects of physical exercise against brain insults of different etiology and anatomy

Likely related to niacin-like vasodilation from rapid B12 absorption

Our Repose Healthcare at-home Vitamin B112 test provides lab-accurate results from a simple finger-prick sample

Typically, excess vitamin B12 exits the body through urine and does not pose serious toxicity concerns

Insider's takeaway The Institute of Medicine has not established a tolerable upper intake level of B12 because studies show no adverse health effects when taking excess levels of B12, either through food or supplements

More serious complications of a B12 deficiency include heart disease, infertility, coordination problems, neurocognitive disorders, peripheral neuropathy and vision loss